Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
nginx - A high performance free open source web server powering busiest sites on the Internet.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
FortiDDoS - FortiDDoS achieves superior & faster DDoS protection from known and zero-day attacks with low latency. Advanced DDoS protection for enterprise data centers.
Better Uptime - We call you when your website goes down
Voxility DDoS Mitigation - DDOS Protection and Mitigation At HostingFuze Network we understand how important uptime is for your sites.